According to my experience, these fiber optics are a huge flop. While they appeared to be made of high quality materials, they were difficult to use and didn't last long. It was a huge disappointment given the reputation of the brand in the world of sports and outdoors. The only pro is that they looked nice out of the package. The cons are numerous - hard to install, didn't stay in place, and broke within a few uses. Save your money and look for an alternative.See full review